Fuel injection pump



Dec.

Filed June 24, 1954 W. O. BISCHOFF ET AL FUEL INJECTION PUMP 3 Sheets-Sheet l [Ill H III III INVENTORS. WALDEMA'E O- BISCHOF'F KENNETH I FA N'CHE'R ATT A/EY 1956 w. o. BISCHOFF ET L 237759233 FUEL INJECTION PUMP Filed June 24, 1954 5 Sheets-Sheet 2 INVENTORS. WALDEMA'E O. IBISCHOFF' KENNETH 1' F'ANCHEE 1956 w. o. BISCHCFF ETA ,775, 33

FUEL INJECTION PUMP Filed June 24, 1954 3 Sheets-Sheet 3 v INVENTOR-S. WA L'DEMAR O. :BISC'HOF'F KENNETH I. F'ANCHEE United States Patent 2,775,233 FUEL lNJECTION PUMP Waldemar o. Bischoff, Holyoke, and Kenneth I. Fancher, Springfield, Mass., assignors to American Bosch Arma Corporation, a corporation of New York Application June 24, 1954, semi No. 439,117 3 Claims. (c1. 123- 140 1 This invention relates to fuel injection pumps and has particular reference to a new and improved arrangement which is combined with the pump and governor for permitting a temporary increase of the quantity of fuel injected beyond the full load fuel quantity as determined by the full load stop provided in the governor for facilitating starting of the engine.

An object of the invention isto provide new and improved means in a fuel injection pump for allowing a temporary increase or additional fuel for facilitating the starting of the engine which arrangement is relatively simple and inexpensive and is fool proof in that it only operates when the engine is stopped and thereby prevents the driver utilizing said means except for the purpose intended, namely, for facilitating starting of the engine.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings. It will be understood that changes may be made in the details of construction and arrangement of parts without departing from the spirit of the invention as set forth in the accompanying claims, as the preferred form has been given by way of illustration only.

Referring to the drawings:

Fig. 1 is a longitudinal sectional view of the fuel injection pump embodying the invention;

Fig. 2 is a fragmentary view, similar to Fig. 1, but on an enlarged scale; and

Fig. 3 is a top view of the apparatus shown in Fig. 1, partially in section.

Referring more particularly to the drawings wherein similar reference characters designate corresponding parts throughout, the pump shown embodying the invention comprises a housing in which is journaled a rotor having a driving portion 11, injection pump portion 12, distributing portion 13 and metering portion 14.

The rotor is provided with a duct or passage whereby the metering portion 14 communicates with the injec tion pump portion 12 and the distributing portion 13 also communicates with injection pump portion 12.

Surrounding the metering portion 14 are provided the outlets 16, each of which is adapted to communicate with a combustion chamber of an internal combustion engine, or the like, and each of which is adapted to communicate with the metering portion 14 through duct or passage 17 in metering portion 14 and the radial passages 18, one of which is provided for each of the outlets 16 and which are adapted to communicate with passage 17 successively upon rotation of rotor 11.

The delivery valve 19 is provided in the passage or duct 15 between the injection pump portion 12 and the distributing portion 13.

Fuel is supplied to the pump from sump 20 through ports 21 and passages 22 in rotor 11.

The inlet passages 22 and the distributing passage 17 are so related as to provide a rotor valve action whereby the filling through ports 22 will occur in the period between the aligning of port 17 with each of the radial ports 18.

In injection pump portion 12, comprises a pair of opposed plungers 23 with the spring 24 therebetween for urging said plungers apart during the suction stroke and the pumping stroke is effected by the internal cam 25 having opposed lobe portions which through the rollers and tappets, urge the plungers toward each other on the pumping stroke.

The metering portion 14 is provided with the radial passages 26 for bypassing fuel from passage 15 and thereby controlling the quantity of fuel injected by the pump.

Overlying passages 26 is the control sleeve 27 which has the ports 23 through which fuel is bypassed and the relation of sleeve 27 and ports. 28 to ports 26 controls the quantity of fuel bypassed.

The centrifugal governor 29 has a portion connected to the sleeve 27 and the ball weights 30 for actuating the sleeve in one direction against the force of governor spring 31 which urges the sleeve in the opposite direction through governor lever 32. l

The governor spring 31 is connected to governor lever 32 and to lever 33 on shaft 34 which shaft is adapted to be rotated by operating lever 35 which is connected to the engine throttle or accelerator pedal of the vehicle whereby the setting of the governor spring 31 may be controlled.

Also connected to governor lever 32 is the torque control member 36 which is adapted to engage the adjustable full load stop 37 which controls the maximum quantity of fuel to be delivered by the pump.

On torque control screw 36 is torque control spring 38 which allows the injecting of a slight additional fuel quantity when the speed of the pump decreases under full load conditions and thereby providing additional fuel for torque or lugging power.

On full load stop member 37 is provided the reduced extension 39 having the pin 40 in a slot 41 in member 42 in which member 39 telescopes and starting spring 43 is positioned between the enlarged head 44 on member 42 and adjustable threaded member 45.

The starting spring 43 is slightly weaker than governor spring 31.

When starting the engine, the governor spring is moved or wound to full load position and if this spring is stronger than starting spring 43, it causes starting spring 43 to collapse and allows the adjustment of sleeve 27 to go into starting position, that is, the position of ports 28 are out of register with port 26 whereby all of the fuel pumped is injected and the full delivery is obtained from the pump.

After the engine starts, and the governor weights 30 begin to function, the governor takes over and functions in its normal manner and the starting apparatus does not again function until the engine is next started.

In starting, the throttle is pulled all the way out or the accelerator pedal is pushed way down which causes governor spring 31 to effect collapse of starting spring 43 and to remain in this position until the engine starts and which the governor takes over for automatic con trol.

Through the described arrangement and construction, absolute assurance is, therefore, given that the arrangement for providing an injection quantity exceeding the full load quantity can function only for the starting of the engine with such mechanism totally inactive during normal operation of the engine.

From the foregoing it will be seen that I have provided new and improved means for obtaining all of the objects and advantages of the invention.

We claim:

for a fuel injection pump, said governor having an operating, lever operatively, connected to the control for the injection pump and a governor spring for positioning said lever, a full load stop adapted to be engaged by said leverfor controlling the normal maximum fuel quantity to be delivered by the pump, said full load stop having a movable portion for allowing the positioning of said lever at a position to provide additional fuel for starting, and spring means for urging said movable portion into said position to allow additional fuel for starting, said spring being slightly weaker than said governor spring and adapted to be totally inactive except during starting of the engine.

'2. In a device of the character described, a governor for. a fuel injection pump, said governor having an operating lever operatively connected to the control for the injection pump and a governor spring for positioning said lever, a full load stop adapted to be engaged by said lever for controlling the normal maximum fuel quantity to be delivered by the pump, said full load stop having a collapsible portion for allowing the positioning of said lever at a position to provide additional fuel for starting, and spring means for urging said collapsible portion into said position to allow additional fuel for starting,

said spring being slightly weaker than said governor spring and adapted tobe totally inactiveexcept during starting of the engine.

3. In a device of the character described, a governor for a fuel injection pump, said governor having an operating lever operatively connected to the control for the injection pump and a governor spring for positioning said lever, ,a full load stop adapted to be engaged by said lever for controlling the normal maximum fuel quantity to be delivered by the pump, said full load stop having a telescoping; portion for allowing the position ing of said lever at a position to provide additional fuel for starting, and spring means for urging said telescoping portion into said position to allow additional fuel for starting, saidv spring being slightly weaker than said governor spring and adapted to be totally inactive except during starting of the engine.

References Cited in the file of this patent' 

